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LOANS HELD FOR INVESTMENT - Additional Information IIII (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment $ 12,385,508,000   $ 12,385,508,000   $ 12,185,483,000
Recoveries 5,424,000 $ 4,805,000 23,595,000 $ 9,453,000  
Significant sales       0  
GNMA [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans pooled amount 59,900,000 66,400,000 59,900,000 66,400,000  
Recognized gain on sale     2,300,000 1,400,000  
United States [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 2,120,798,000   2,120,798,000   2,022,261,000
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 3,254,577,000   3,254,577,000   3,174,232,000
Recoveries 958,000 132,000 6,077,000 222,000  
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 2,423,309,000   2,423,309,000   2,317,083,000
Recoveries 393,000 56,000 433,000 224,000  
Commercial Portfolio Segment [Member] | United States [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Significant Purchases     79,100,000    
Commercial Portfolio Segment [Member] | United States [Member] | Commercial And Industrial Sector [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Significant Purchases     65,400,000 28,000,000.0  
Loans held for investment 942,632,000   942,632,000   924,824,000
Commercial Portfolio Segment [Member] | United States [Member] | Commercial Real Estate [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Significant Purchases     13,700,000    
Loans held for investment 662,549,000   662,549,000   526,446,000
Residential Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 2,809,666,000   2,809,666,000   2,821,726,000
Recoveries 446,000 757,000 718,000 1,254,000  
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] | Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable Significant Purchases     900,000 1,900,000  
Loans held for investment 6,800,000   6,800,000   7,900,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 2,778,270,000   2,778,270,000   2,789,487,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] | Federal National Mortgage Association Fnma Insured Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Gain from sale of loans     300,000 600,000  
Loans sold     15,100,000 22,800,000  
Residential Portfolio Segment [Member] | United States [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 485,364,000   485,364,000   465,720,000
Residential Portfolio Segment [Member] | United States [Member] | Performing Financial Instruments [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 477,309,000   477,309,000   458,493,000
Consumer Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 3,711,999,000   3,711,999,000   3,657,665,000
Recoveries 3,613,000 $ 3,451,000 16,343,000 $ 7,281,000  
Consumer Portfolio Segment [Member] | Bulk Sale Of Fully Charged-Off Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Recoveries     9,500,000    
Repurchase liability 500,000   500,000    
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 3,691,361,000   3,691,361,000   3,635,221,000
Consumer Portfolio Segment [Member] | United States [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment 8,070,000   8,070,000   5,895,000
Consumer Portfolio Segment [Member] | United States [Member] | Performing Financial Instruments [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for investment $ 8,034,000   $ 8,034,000   $ 5,824,000